What I wanted to say is, that I have no idea of the whole pdf format at all. I don't know whether there are "layers" or anything like that at all in the pdf format. I was just playing around with some pdf tools and looking at the result...
However: maybe zuflacht can try this pdf on his M92, it's the book from the first post in a slightly different format (only first 30 pages and in png) and there's a small chance it might be displayed correctly on the M92:
output.pdf